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This article describes the use of an automotive vehicle manifold absolute pressure (MAP) sensor component as a tool to provide valve and air intake characteristics for each cylinder to a diagnostic system.
English (United States)
This text was extracted from a PDF file.
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Application of Conventional Automotive Manifold Absolute Pressure
Sensor As Engine Diagnostic Instrument
This article describes the use of an automotive vehicle manifold absolute
pressure (MAP) sensor component as a tool to provide valve and air intake
characteristics for each cylinder to a diagnostic system.
Typically, when vacuum leaks are suspected, a technician terminal directs
the technician to spray carburetor cleaner at the intake manifold gasket surfaces
and to look for changes in engine RPM. If the technician is not using a
tachometer or other RPM indicator, changes in the sound of the engine must be
relied on to infer a change in engine RPM. If a vacuum leak is slight, the change
in RPM may be small and not reliably detectable by ear. In another instance, the
technician terminal directs the technician to use a vacuum gauge to read engine
intake manifold vacuum. It then asks the technician if the reading was
acceptable. Both of the procedures above are subject to human interpretation.
The technique disclosed therein eliminates human interpretation.
The human element is removed by making use of an existing MAP sensor. A
vehicle probe interface (VPI) is added, as shown in the drawing. The VPI has the
capability to connect the MAP sensor and capacitively coupled spark detector to
the technician terminal, it is necessary to previously determine if the sensor is
good or bad. The operational condition of the sensor will be determined while
the sensor is in use...